Earth-boring apparatus



A. R. MANGNALL.

EARTH BORING APPARATUS Aug. 17 1926.

4 Sheets-Shet 1 Filed April 29 1924 Aug. 17, 1926.. 1,596,848

A. R. MANGNALL,

EARTH BORING APPARATUS Filed April 2? 1924 4 Sheets-Sheet 2 Aug. 11,19269- 1,596,848

A. R. MANGNALL EARTH BORING APPARATUS Filed April 29, 1,92 4Sheecs-Sheet :5

Aug. 17 IQZfia A R. MANGNALL EARTH BORING APPARATUS Filed April 29 19244 Sheets-Sheet w V w III 1x16214191 Patented Aug. 17, 1926.

PATENT ARTHUR BIVINGTON IvIAITGNALL, QF CHESTER, ENGLAND.

EARTH-BORING APPARATUS.

Application filed April 29, 1924, Serial No.

This invention relates to earth boring ap paratus of the kind inwhich apilot head is forced through the-ground and bores by displacement, andhas particular reference to the machine or apparatus employed forimparting the necessary movement to the pilot head. v

In British specification No. 153,981 there isdescribed a form ofapparatus for the .above purpose consisting of hydraulic cylinder andram which is adapted to be used to push the pilot head through theground, the cylinder being adapted to be elevated in the boring pit whenit is required to exert a pulling action as, for example, whenwithdrawing the pilot head.

The object of the present invention is to devise an improved form ofapparatus for the above purpose and the invention'consists in anapparatus which is reversible in its action while, remaining undisturbedin the boringpit, such an apparatus being particularly suitable for usewhen producing enlarged bores since it enables a small bore to be firstformed by pushing in the usual manner after which an enlarged boringmember maybe entered in the bore at the end remote from the apparatusand may then be pulled through so as to enlarge the bore.

It will be understood, however, that the reversal of the apparatus maybe employed for withdrawing the pilot or for drawing a lining of anysuitable form or a cable or the like into the bore or for any otherdesired purpose.

The invention also consists in other details and arrangementshereinafter de scribed or indicated.

The accompanying drawings illustrate one mode of carrying out theinvention Figure 1 is an elevation, partly in section, of one form ofapparatus in accordance with the invention;

Figure 2 is a plan;

Figure 3 is an end elevation, and

Figure 4c is a sectional elevation;

Figures 5 and 6 are diagrammatic views showing the apparatus in use, and

Figure 7 is a view illustrating a detail.

In carrying my invention into effect in one convenient manner, I form myimproved apparatus with two side tubes or like members a which by theaid of jack- 709,913, mi in Great BritainMay 3, 192a.

ing screws a. or the like maybe positioned against end plates or otherfittings within the boringpit in order to maintain the apparatus in anyposition in which it may have been set for the purpose of obtaining thenecessary alignment or direction of bore.

Mounted upon such side tubes are two cylinders .7) connected by suitablecross members 0 having movable or removable clampingdevices (5 bywhichthe parts (such as the pilot bar a, push pipes and the like) to beforced through the bore are securely fixed in the apparatus and eitheror both of such cylinders may act as hydraulic cylinders, the ram orrams 'for the same being formed by pistonsor enlargements f on the sidetubes or like members. The arrangement is such that by suitablycontrollingthe pressure and exhaust by'means of a valve or valves 9, itprovided for the purpose the cylinders and parts carried thereby aremovable as a whole in either direction upon the side tubes or likesupporting members and the extent of travel of such hydraulic apparatuson the side supports may be adjusted according to the length of pushpipes or other apparatus employed It will thus be seen that the pushpipes or the like may be mounted in position by 'means of the clampswithout disturbance of the apparatus within the boring pit and also theapparatus is readily reversible in its reins.

action without it being necessary in any way to alter the setting,adjustment or position of the apparatus within the pit.

In Figure 5 the apparatus is shown as being used for pushing the pilotin the usual manner, while Figure 6 shows the enlarging head 2' beingdrawn through to enlarge the bore, while at tl e same time a pipe orlining k is also being drawn into the bore,

Figure 7 shows the enlarging head secured in place by an adaptor Z.

Means are provided for laterally and vertically adjusting the apparatusto secure proper alignment.

In the construction illustrated there are provided end plates 11 adaptedto abut against the ends of the boring pit and the apparatus is carriedby end frames or members a movable laterally and vertically in relationto the end plates. The lateral movement is eltected by the screws 9 anda the vertical adjustment by the screws 0,

the screws 0 being movable in slots in the flanges n and the pins 0being movable in slots in the flanges 01 in order to permit of thelateral adjustment of the frame members.

Being reversible in its action, the apparatus affords a very convenientmeans of enlarging a bore in the manner hereinbefore referred to and itmay be also employed for simultaneously or subsequently drawing anydesired form of liner, cable or the like into the bore.

It will be understood that the invention is not to be limited to theconstructional details which are hereinbefore given by way of example,as the essential feature of the V invention is the securing of a form ofapparatus which is reversible in its action a without requiring to bealtered in position in the pit and any means by which this object may beachieved must beregarded as falling within the spirit and scope of theinvention.

Having now described my invention, what I claim as new and desiretosecure by Letters Patent is bpring bar through the earth to form aborebydisplacement, means for removably securingsaid bor ng bar to sa dhydrauhc .means and means for reversing the opera- 7 tion of saidhydraulic means wh le maintaining substantially the same position asthat which it occupied during pushing.

3. Earth boring apparatus comprising adjustable side supports, hydraulicmeans carried thereby for actuating a boring bar, means for reversingthe operation of said hydraulic means while remaining undisturbed in theboring pit and means for adjusting the position of said side supportsand the parts carried thereby.

4:- Earth boring apparatus comprising side supports, hydraulic meanscarried thereon for actuating a boring bar, means for reversing theoperation of said hydraulic means while remaining undisturbed in theboring pit, end plates against which said side.

supports abut by means of frame members carrying the side supports andmeans for adjustingsaid frame members laterally and vertically; v

5. Earth boring apparatus comprising side supports, a hydrauliccylindermovably mounted on one of said supports and cooperating with apiston fixed thereon, means for removably securing a boring bar to saidmovable cylinder and means torsupplying fluid pressure to one side orthe other of said lined piston.

6,. Earth boring apparatus comprising side supports, a hydrauliccylinder movably mounted on one'of said supports and cooperating with apiston fixed thereon, means for removably securing a boring bar to saidcylinder, means for supplying fluid pressure to one side or the other ofsaid fixed piston and means for adjusting said side supports laterallyand vertically.

In testimony whereof I have signed my name to this specification.

ARTHUR RIVINGTON MANGNALL.

